Hadithcore
Sahih al-Bukhari, 5464
sahih

Narrated Nafi:

Once Ibn Umar was taking his supper while he was listening to the recitation of (Quran by) the Imam (in the Isha prayer).

وَعَنْ أَيُّوبَ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ عَنِ النَّبِيِّ صلى الله عليه وسلم نَحْوَهُ‏.‏ وَعَنْ أَيُّوبَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّهُ تَعَشَّى مَرَّةً وَهْوَ يَسْمَعُ قِرَاءَةَ الإِمَامِ‏.‏

References2 variants
In-Book Reference
Book 70, Hadith 93
USC-MSA web (English) reference
Vol. 7, Book 65, Hadith 373 (deprecated numbering scheme)